640627376 has 10 divisors (see below), whose sum is σ = 1241215572. Its totient is φ = 320313680.

The previous prime is 640627333. The next prime is 640627381. The reversal of 640627376 is 673726046.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20019590 + ... + 20019621.

Almost surely, 2^640627376 is an apocalyptic number.

It is an amenable number.

640627376 is a deficient number, since it is larger than the sum of its proper divisors (600588196).

640627376 is a wasteful number, since it uses less digits than its factorization.

640627376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40039219 (or 40039213 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 41.

The square root of 640627376 is about 25310.6178510126. The cubic root of 640627376 is about 862.0553758458.

The spelling of 640627376 in words is "six hundred forty million, six hundred twenty-seven thousand, three hundred seventy-six".